Triyono, Wega Trisunaryanti, Adriana Dwi Putri, Ayyik Lutfiana, and Kumala Dewi. “Transesterification of Waste Cooking Oil Using NH2 MCM-41 Base Catalyst: Effect of Methanol Oil Mole Ratio and Catalyst Oil Weight Ratio towards Conversion of Ester”. Asian Journal of Chemistry 30, no. 5 (March 29, 2018): 953–957. Accessed July 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/30_5_4.